/*
silverPDF is sponsored by Aleyant Systems (http://www.aleyant.com)

silverPDF is based on PdfSharp (http://www.pdfsharp.net) and iTextSharp (http://itextsharp.sourceforge.net)

Developers: Ai_boy (aka Oleksii Okhrymenko)

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above information and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR SPONSORS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

*/
#region PDFsharp - A .NET library for processing PDF
//
// Authors:
//   Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Diagnostics;
using System.Collections;
using PdfSharp.Drawing;
using PdfSharp.Fonts.TrueType;
using System.Collections.Generic;

namespace PdfSharp.Fonts.TrueType
{
#if true
/// <summary>
  /// Global table of TrueType fontdescriptor objects.
  /// </summary>
  class FontDescriptorStock
  {
    private FontDescriptorStock()
    {
      this.table = new Hastable();
    }

    /// <summary>
    /// Gets the FontDescriptor identified by the specified FontSelector. Returns null if no
    /// such objects exists.
    /// </summary>
    public FontDescriptor FindDescriptor(FontSelector selector)
    {
      if (selector == null)
        return null;

      FontDescriptor descriptor = this.table[selector] as FontDescriptor;
      return descriptor;
    }

    ///// <summary>
    ///// Gets the FontDescriptor identified by the specified FontSelector. If no such objects 
    ///// exists, a new FontDescriptor is created and added to the stock.
    ///// </summary>
    //public FontDescriptor CreateDescriptor(FontSelector selector)
    //{
    //  if (selector == null)
    //    throw new ArgumentNullException("selector");

    //  FontDescriptor descriptor = this.table[selector] as FontDescriptor;
    //  if (descriptor == null)
    //  {
    //    descriptor = new TrueTypeDescriptor(selector);
    //    this.table.Add(selector, descriptor);
    //  }
    //  return descriptor;
    //}

    /// <summary>
    /// Gets the FontDescriptor identified by the specified FontSelector. If no such objects 
    /// exists, a new FontDescriptor is created and added to the stock.
    /// </summary>
    public FontDescriptor CreateDescriptor(XFont font)
    {
      if (font == null)
        throw new ArgumentNullException("font");

      FontSelector selector = new FontSelector(font);
      FontDescriptor descriptor = this.table[selector] as FontDescriptor;
      if (descriptor == null)
      {
        lock (typeof(FontDescriptorStock))
        {
          // may be created by other thread meanwhile
          descriptor = this.table[selector] as FontDescriptor;
          if (descriptor == null)
          {
            descriptor = new TrueTypeDescriptor(font, font.privateFontCollection);
            this.table.Add(selector, descriptor);
          }
        }
      }
      return descriptor;
    }

    /// <summary>
    /// Gets the FontDescriptor identified by the specified FontSelector. If no such objects 
    /// exists, a new FontDescriptor is created and added to the stock.
    /// </summary>
    public FontDescriptor CreateDescriptor(XFontFamily family, XFontStyle style)
    {
      if (family == null)
        throw new ArgumentNullException("family");

      FontSelector selector = new FontSelector(family, style);
      FontDescriptor descriptor = this.table[selector] as FontDescriptor;
      if (descriptor == null)
      {
        lock (typeof(FontDescriptorStock))
        {
          // may be created by other thread meanwhile
          descriptor = this.table[selector] as FontDescriptor;
          if (descriptor == null)
          {
            XFont font = new XFont(family.Name, 10, style);
            descriptor = new TrueTypeDescriptor(font, font.privateFontCollection);
            if (this.table.ContainsKey(selector))
              GetType();
            else
              this.table.Add(selector, descriptor);
          }
        }
      }
      return descriptor;
    }

    public FontDescriptor CreateDescriptor(string idName, byte[] fontData)
    {
      FontSelector selector = new FontSelector(idName);
      FontDescriptor descriptor = this.table[selector] as FontDescriptor;
      if (descriptor == null)
      {
        lock (typeof(FontDescriptorStock))
        {
          // may be created by other thread meanwhile
          descriptor = this.table[selector] as FontDescriptor;
          if (descriptor == null)
          {
            descriptor = new TrueTypeDescriptor(idName, fontData);
            this.table.Add(selector, descriptor);
          }
        }
      }
      return descriptor;
    }

    public static FontDescriptorStock Global
    {
      get
      {
        if (FontDescriptorStock.global == null)
        {
          lock (typeof(FontDescriptorStock))
          {
            if (FontDescriptorStock.global == null)
              FontDescriptorStock.global = new FontDescriptorStock();
          }
        }
        return FontDescriptorStock.global;
      }
    }
    static FontDescriptorStock global;

    Hastable table;

    /// <summary>
    /// A collection of information that uniquely idendifies a particular font.
    /// Used to map XFont to PdfFont.
    /// There is a one to one relationship between a FontSelector and a TrueType/OpenType file.
    /// </summary>
    internal class FontSelector
    {
      public FontSelector(XFont font)
      {
        this.name = font.Name;
        this.style = font.Style;
      }

      public FontSelector(XFontFamily family, XFontStyle style)
      {
        this.name = family.Name;
        this.style = style;
      }

      public FontSelector(string idName)
      {
        this.name = idName;
        this.style = XFontStyle.Regular;
      }

      public string Name
      {
        get { return this.name; }
      }
      string name;

      public XFontStyle Style
      {
        get { return this.style; }
      }
      XFontStyle style;

      public static bool operator ==(FontSelector selector1, FontSelector selector2)
      {
        if (selector1 != null)
          selector1.Equals(selector2);
        return selector2 == null;
      }

      public static bool operator !=(FontSelector selector1, FontSelector selector2)
      {
        return !(selector1 == selector2);
      }

      public override bool Equals(object obj)
      {
        FontSelector selector = obj as FontSelector;
        if (obj != null && this.name == selector.name)
          return this.style == selector.style;
        return false;
      }

      public override int GetHashCode()
      {
        return this.name.GetHashCode() ^ this.style.GetHashCode();
      }

      /// <summary>
      /// Returns a string for diagnostic purposes only.
      /// </summary>
      public override string ToString()
      {
        string variation = "";
        switch (this.style)
        {
          case XFontStyle.Regular:
            variation = "(Regular)";
            break;

          case XFontStyle.Bold:
            variation = "(Bold)";
            break;

          case XFontStyle.Italic:
            variation = "(Italic)";
            break;

          case XFontStyle.Bold | XFontStyle.Italic:
            variation = "(BoldItalic)";
            break;
        }
        return this.name + variation;
      }
    }
  }
#else
  /// <summary>
  /// Global table of TrueType fontdescriptor objects.
  /// </summary>
  class FontDescriptorStock
  {
    private FontDescriptorStock()
    {
      this.table = new Hastable();
    }

    /// <summary>
    /// Gets the FontDescriptor identified by the specified FontSelector. Returns null if no
    /// such objects exists.
    /// </summary>
    public FontDescriptor FindDescriptor(FontSelector selector)
    {
      if (selector == null)
        return null;

      FontDescriptor descriptor = this.table[selector] as FontDescriptor;
      return descriptor;
    }

    ///// <summary>
    ///// Gets the FontDescriptor identified by the specified FontSelector. If no such objects 
    ///// exists, a new FontDescriptor is created and added to the stock.
    ///// </summary>
    //public FontDescriptor CreateDescriptor(FontSelector selector)
    //{
    //  if (selector == null)
    //    throw new ArgumentNullException("selector");

    //  FontDescriptor descriptor = this.table[selector] as FontDescriptor;
    //  if (descriptor == null)
    //  {
    //    descriptor = new TrueTypeDescriptor(selector);
    //    this.table.Add(selector, descriptor);
    //  }
    //  return descriptor;
    //}

    /// <summary>
    /// Gets the FontDescriptor identified by the specified FontSelector. If no such objects 
    /// exists, a new FontDescriptor is created and added to the stock.
    /// </summary>
    public FontDescriptor CreateDescriptor(XFont font)
    {
      if (font == null)
        throw new ArgumentNullException("font");

      FontSelector selector = new FontSelector(font);
      FontDescriptor descriptor = this.table[selector] as FontDescriptor;
      if (descriptor == null)
      {
        lock (typeof(FontDescriptorStock))
        {
          // may be created by other thread meanwhile
          descriptor = this.table[selector] as FontDescriptor;
          if (descriptor == null)
          {
            descriptor = new TrueTypeDescriptor(font, font.privateFontCollection);
            this.table.Add(selector, descriptor);
          }
        }
      }
      return descriptor;
    }

    /// <summary>
    /// Gets the FontDescriptor identified by the specified FontSelector. If no such objects 
    /// exists, a new FontDescriptor is created and added to the stock.
    /// </summary>
    public FontDescriptor CreateDescriptor(XFontFamily family, XFontStyle style)
    {
      if (family == null)
        throw new ArgumentNullException("family");

      FontSelector selector = new FontSelector(family, style);
      FontDescriptor descriptor = this.table[selector] as FontDescriptor;
      if (descriptor == null)
      {
        lock (typeof(FontDescriptorStock))
        {
          // may be created by other thread meanwhile
          descriptor = this.table[selector] as FontDescriptor;
          if (descriptor == null)
          {
            XFont font = new XFont(family.Name, 10, style);
            descriptor = new TrueTypeDescriptor(font, font.privateFontCollection);
            if (this.table.ContainsKey(selector))
              GetType();
            else
              this.table.Add(selector, descriptor);
          }
        }
      }
      return descriptor;
    }

    public FontDescriptor CreateDescriptor(string idName, byte[] fontData)
    {
      FontSelector selector = new FontSelector(idName);
      FontDescriptor descriptor = this.table[selector] as FontDescriptor;
      if (descriptor == null)
      {
        lock (typeof(FontDescriptorStock))
        {
          // may be created by other thread meanwhile
          descriptor = this.table[selector] as FontDescriptor;
          if (descriptor == null)
          {
            descriptor = new TrueTypeDescriptor(idName, fontData);
            this.table.Add(selector, descriptor);
          }
        }
      }
      return descriptor;
    }

    public static FontDescriptorStock Global
    {
      get
      {
        if (FontDescriptorStock.global == null)
        {
          lock (typeof(FontDescriptorStock))
          {
            if (FontDescriptorStock.global == null)
              FontDescriptorStock.global = new FontDescriptorStock();
          }
        }
        return FontDescriptorStock.global;
      }
    }
    static FontDescriptorStock global;

    Hastable table;

    /// <summary>
    /// A collection of information that uniquely idendifies a particular font.
    /// Used to map XFont to PdfFont.
    /// There is a one to one relationship between a FontSelector and a TrueType/OpenType file.
    /// </summary>
    internal class FontSelector
    {
      public FontSelector(XFont font)
      {
        this.name = font.Name;
        this.style = font.Style;
      }

      public FontSelector(XFontFamily family, XFontStyle style)
      {
        this.name = family.Name;
        this.style = style;
      }

      public FontSelector(string idName)
      {
        this.name = idName;
        this.style = XFontStyle.Regular;
      }

      public string Name
      {
        get { return this.name; }
      }
      string name;

      public XFontStyle Style
      {
        get { return this.style; }
      }
      XFontStyle style;

      public static bool operator ==(FontSelector selector1, FontSelector selector2)
      {
        if (selector1 != null)
          selector1.Equals(selector2);
        return selector2 == null;
      }

      public static bool operator !=(FontSelector selector1, FontSelector selector2)
      {
        return !(selector1 == selector2);
      }

      public override bool Equals(object obj)
      {
        FontSelector selector = obj as FontSelector;
        if (obj != null && this.name == selector.name)
          return this.style == selector.style;
        return false;
      }

      public override int GetHashCode()
      {
        return this.name.GetHashCode() ^ this.style.GetHashCode();
      }

      /// <summary>
      /// Returns a string for diagnostic purposes only.
      /// </summary>
      public override string ToString()
      {
        string variation = "";
        switch (this.style)
        {
          case XFontStyle.Regular:
            variation = "(Regular)";
            break;

          case XFontStyle.Bold:
            variation = "(Bold)";
            break;

          case XFontStyle.Italic:
            variation = "(Italic)";
            break;

          case XFontStyle.Bold | XFontStyle.Italic:
            variation = "(BoldItalic)";
            break;
        }
        return this.name + variation;
      }
    }
  }
#endif
}